Multiscale characterization of nanostructured Al–Si–Zr alloys obtained by rapid solidification method

Abstract

Properties of engineering metallic alloys (e.g., fracture toughness, corrosion resistance) are often limited by the presence of primary intermetallic particles which form during conventional solidification. Rapid solidification brings about much more homogenous amorphous and/ or nanocrystalline structure with reduced density of primary particles. Rapidly solidified thin ribbons obtained by melt spinning are usually considered as intrinsically homogenous. However, due to different cooling conditions at the wheel surface and on the side exposed to the ambient environment, structure of such ribbons may vary significantly across its thickness. The materials studied in this study were 30-40 lm thickness ribbons of nanocrystalline hyper-and hypo-eutectic Al-Si-Zr alloys produced by melt-spinning method. Transmission electron microscopy and high resolution scanning transmission electron microscopy were used to characterize the structure homogeneity across the ribbons. Thin foils for transmission observations were prepared by focused ion beam system. Microstructural observations confirmed nanocrystalline character of Al-Si-Zr alloys. However, these observations revealed inhomogeneity of the structure across the ribbon width.

Development and Characterization of Cast Modified SI-CU-MG Alloys for Heat Resistant Power Train Applications

“…However, the addition of carbides such as TiC, SiC etc. decomposed during melting and reduced the efficiency [39,40,41,42].…”

High-Temperature Surface Oxide Growth Kinetics of Al–Si–Zr Bulk Alloys and Ribbons

“…Dotting Al-Si alloys with some third constituent might change some of their properties (especially the mechanical properties and the oxidation resistance). Recently, some new cast Al-alloys [1] and Al-Si-alloys with zirconium additions were designed [2,3]. This transition metal affects the mechanical properties of the cast alloys by diminishing the grain size and by the formation of intermetallic compounds [4].…”

The quantitative relationship between microstructure and mechanical property of a melt spun Al–Mg alloy

“…Due to the lightweight attribute, melt spun Al alloys (both amorphous and crystalline) have been paid particular attention and extensive experimental studies have been conducted on this class of melt spun materials [10,12,16,[23][24][25][26][27][28][29][30][31][32], which involve characterization of microstructures and testing of mechanical properties. The available experimental results reveal brittleness of amorphous ribbons [30][31][32], which limits their widespread applications.…”